Explanation
Width of walk is 6 ft., or \(6 \times 12=72\) in. Width of each brick is 4 in. Number of bricks that can be fitted along the width is \(72 \div 4 = 18\).
Length of walk is 24 ft., or \(24 \times 12=288\)in. Length of each brick is 8 in. Number of bricks that can be fitted along the length is \(288 \div 8=36\)
Therefore, the answer is:
\(18 \times 36 = 648\)